GM Service Manual Online
For 1990-2009 cars only

This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link to communicate. Some modules may have multiple communication circuits passing through them without actively communicating on that data link. This table is used to assist in correcting a communication malfunction. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation.

Control Module

Data Link Type

Diagnostic Procedure

Schematic Reference: Data Communication Schematics

Audio Amplifier

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Automatic Forward Lighting System (AFS) Module

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Auxiliary Body Control Module (XBCM)

    • High Speed GMLAN
    • Low Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Body Control Module (BCM)

    • High Speed GMLAN
    • Low Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Driver Door Module (DDM)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Driver Position (Memory Seat) Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Electronic Brake Control Module (EBCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Electronic Park Brake Control Module

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Electronic Suspension Control (ESC) Module

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Engine Control Module (ECM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Fuel System Control Module (FSCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

HVAC Control Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Inflatable Restraint Sensing and Diagnostic Module (SDM)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Inflatable Restraint Passenger Presence System (PPS)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Instrument Panel Cluster (IPC)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Passenger Door Module (PDM)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Pedestrian Impact Detection System (PIDS) Module

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Radio

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Radio HVAC Control Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Rear Park Assist (RPA) Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Remote Control Door Lock Receiver

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Theft Deterrent Alarm

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Theft Deterrent Control Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Transfer Case Control Module

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Transmission Control Module

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

TV Antenna Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Vehicle Control Interface Module (VCIM)

    • High Speed GMLAN
    • Low Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device